[Mail I send to Dylan tends to bounce so I'm using both email
addresses I have for him and hoping that he's subscribed to ghc-bugs
in case both of those addresses fail...]
Dylan Thurston [EMAIL PROTECTED] writes:
Ken Shan told me about QuickCheck, which seems like the right way to
test such
Send us improved testsuites and we'll happily add them to our suites.
The most relevant Hugs testsuites are:
intTest.{hs,input,output}
This one appears to have a common ancestry with arith011 in
fptools/testsuite/tests/ghc-regress/numeric/should_run. However
arith011 has grown a bit
After a looking a little more, there seem to be other problems
(including errors in my proposed solution). I don't know where the
code for quotRem is, but it is also buggy. For instance,
Prelude 9 `quotRem` (-5)
(-1,4)
(The correct answer is (-1,-4).) I'm frankly astonished: has
I'm shocked that non of the three Haskell implementations had a test
suite that caught this problem.
Take a look at
fptools/testsuite/tests/ghc-regress/numeric/should_run/arith0011.hs.
There may be one or two wrong answers lurking in there, but
that's a lot
of results to check by
However, it's easy to write a program to verify such results,
assuming you trust your addition and multiplication and comparisons:
[...]
Also, looking at arith003, there are a few more test cases I might
include, with quotient/remainder, say, 3/4 or 1/2 of maxInt. You
also don't seem to
